'Supernatural's Final Season Will Bring Back the Winchesters' Dead Allies

Ileane Rudolph
Fall Preview Shane Harvey/The CW

The demon-slaying, world-saving Winchesters, Sam (Jared Padalecki) and Dean (Jensen Ackles), plus angel Castiel (Misha Collins), have reached their final season, but plenty of adventures have yet to play out.

As in the opening moments of Supernatural Season 15, which picks up where we left the heroes — surrounded by ghouls unleashed from hell by a furious God (Rob Benedict).

Their immediate mission is "how to put these hell ghosts back where they belong before they do too much damage," says executive producer Andrew Dabb.

Within that monster mash are not only villains dispatched by the brothers in earlier seasons, but also slain allies like prophet Kevin (Osric Chau) and deaf hunter Eileen (Shoshannah Stern).

Sam & Dean Have Work to Do in 'Supernatural' Season 15 Trailer (PHOTOS)

Sam & Dean Have Work to Do in 'Supernatural' Season 15 Trailer (PHOTOS)

Also, check out photos from the premiere and the season poster as the Winchesters face familiar monsters.

As for the less-than-holy deity — could half-angel Jack (Alexander Calvert), killed at last season’s end, be resurrected and take him on?  

(Diyah Pera/The CW)

Supernatural, 15th and Final Season Premiere, Thursday, October 10, 8/7c, The CW

11 'Supernatural' Deaths That Still Hurt (PHOTOS)

11 'Supernatural' Deaths That Still Hurt (PHOTOS)

Even years later, these losses are heartbreaking.